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thumb|Mammals excrete urine through the urinary system. Excretion is elimination of metabolic waste, which is an essential process in all organisms. In vertebrates, this is primarily carried out by the lungs, kidneys, and skin. This is in contrast with secretion, where the substance may have specific tasks after leaving the cell. For example, placental mammals expel urine from the bladder through the urethra, which is part of the excretory system. Unicellular organisms discharge waste products directly through the surface of the cell. Another example would be how mammals release solid waste (f
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Excretion is the process by which organisms eliminate metabolic waste products that their bodies produce during normal functioning. In vertebrates like mammals, this waste is removed primarily through the lungs, kidneys, and skin—for example, mammals expel urine through the urinary system and solid waste through the digestive system.
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- purl.obolibrary.org/obo/GO_0007588
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